Choosing a transmission crossmember

[Matt_50]

I want to buy one of those universal bolt in crossmembers for my trans. I cut up the factory one and kinda made it work... but I'll save myself some future headaches by just buying one.

Factory 50 frame. Th350 trans.

I've never bought a universal crossmember before so I want to make sure I have this correct. I need to buy a mount pad, anchor style? I need to install the pad, support the trans and then measure how far down the bottom of pad is compared to bottom of frame rails and that's my drop right?

And to get the angle perfect, I can shim some if needed?